<nav id="nav" class="page_width box_sizing">
    <a href="<?=base_url('/home/index/')?>" class="nav_item">
        <span class="home"><img src="images/nav_1.jpg" alt="" /></span>
        <span class="nav_name">首页</span>
    </a>
    <a href="<?=base_url('/home/seller_category/?MemberId='.$MemberId)?>" class="nav_item">
        <span class="category"><img src="images/nav_4.jpg" alt="" /></span>
        <span class="nav_name">分类</span>
    </a>
    <a href="http://wpa.qq.com/msgrd?v=3&uin=<?=$detail['QQ']?>&site=qq&menu=yes" class="nav_item">
        <span class="contact"><img src="images/contact.jpg" alt="" /></span>
        <span class="nav_name">联系卖家</span>
    </a>
    <a href="/yjzb/login.php" id="me" class="nav_item">
        <span class="me"><img src="images/nav_3.jpg" alt="" /></span>
        <span class="nav_name">我</span>
    </a>
</nav>